High-momentum components in the 1p orbitals of 16O

Blomqvist, K. I.; Boeglin, W.; Böhm, R.; Distler, M. O.; Edelhoff, R.; Friedrich, J.; Geiges, R.; Kahrau, M.; Korn, M.; Krämer, H.; Krygier, K. W.; Kunde, V. G.; Kuss, M.; Lac, J.; Liesenfeld, A.; Merle, K.; Neuhausen, R.; Offermann, E.A.J.M.; Pospischil, Th.; Potokar, M.; Richter, A.; Rokavec, A.; Rosner, G.; Sauer, P. U.; Schardt, S.; Serdarević, A.; Veit, Th.; Vodenik, B.; Wagner, Andreas; Walcher, Th.; Wolf, S.

doi:10.1016/0370-2693(94)01540-s

Cited by 35 publications

(22 citation statements)

References 12 publications

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“…The experimental data on the spectral function at high momenta and small missing energies can very well be described in terms of momentum distributions derived from IPSM calculations if the theoretical strengths are quenched by a global spectroscopic factor Z [2,3,4]. A more detailed analysis of the spectral function showed that correlations should show up in an enhancement of the spectral function, as compared to IPSM, at high momenta and large missing energies [5,6].…”

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confidence: 97%

Spectral function at high missing energies and momenta

et al. 2004

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The nuclear spectral function at high missing energies and momenta has been determined from a self-consistent calculation of the Green's function in nuclear matter using realistic nucleon-nucleon interactions. The results are compared with recent experimental data derived from (e, e ′ p) reactions on 12 C. A rather good agreement is obtained if the Green's functions are calculated in a non-perturbative way.

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confidence: 97%

Spectral function at high missing energies and momenta

et al. 2004

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“…The correlated strength also contributes to the region dominated by the IP strength, but there it cannot be isolated via (e,e'p). While initial searches for high-k components [9,10] were restricted to low-lying states, it has been understood for some time that the SRC produce strength at high k and E simultaneously [3,11].…”

mentioning

confidence: 99%

Correlated Strength in the Nuclear Spectral Function

Rohe

Armstrong²,

Asaturyan³

et al. 2004

Phys. Rev. Lett.

115

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We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k, E) at high nucleon momenta k and large removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable uncertainty from the lack of strength in the independent-particle region. This experiment locates by direct measurement the correlated strength predicted by theory.PACS numbers: 21.10. Jx, 25.30.Fj Introduction. The concept of independent particle (IP) motion has been rather successful in the description of atomic nuclei; the shell model, based on the assumption that nucleons move, independently from each other, in the average potential created by the interaction with all other nucleons, has been able to explain many nuclear properties. This success often comes at the expense of the need to use effective operators that implicitly account for the shortcomings of the IP basis.A more fundamental approach to the understanding of nuclei has to start from the underlying nucleon-nucleon (N-N) interaction. This N-N interaction is well known from many experiments on N-N scattering, and several modern parameterizations are available. The N-N interaction exhibits a strongly repulsive central interaction at small internucleon distances, and at medium distances a strong tensor component. These features lead to properties of nuclear wave functions that are beyond what is describable in terms of an IP model. In particular, strong short-range correlations (SRC) are expected to occur.The effects of the short-range correlations were studied for systems where the Schrödinger equation can be solved for a realistic N-N interaction [1]. Very light nuclei (today up to A≤10) and infinite nuclear matter are amongst the systems where this is feasible [2,3,4]. The corresponding calculations show that in a microscopic description of nuclear systems the short-range and tensor parts of the N-N interaction have a very important, not to say dominating, influence without which not even nuclear binding can be explained.The consequences of these short-range correlations are that the momentum distributions of nucleons acquire a tail extending to very high momenta k and at the same

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“…Lapikás et al thus concluded that the Mainz data were normalized incorrectly. Recall that similar doubts regarding the normalization of the companion 16 O(e, e ′ p) experiment [15] at Mainz had been expressed earlier by Kelly [4], but independent data duplicating the measurement are unfortunately not available. After excluding the Mainz data, Lapikás et al determined that the summed 1p-shell strength for 12 C could in fact be deduced from data for Q 2 < 0.3 (GeV/c) 2 with an uncertainty of ±3%.…”

Section: B Q 2 -Dependence Of Normalization Factorsmentioning

confidence: 86%

“…The knockout of 1p-shell protons in 16 O(e, e ′ p) was studied by Bernheim et al [11] and Chinitz et al [12] at Saclay, Spaltro et al [13] and Leuschner et al [14] at NIKHEF, and Blomqvist et al [15] at Mainz at Q 2 < 0.4 (GeV/c) 2 . In these experiments, cross-section data for the lowest-lying fragments of each shell were measured as a function of p miss , and normalization factors (relating how much lower the measured cross-section data were than predicted) were extracted.…”

Section: A 1p-shell Knockoutmentioning

confidence: 99%

“…[2] -although the relativistic model improves our description of A LT , recoil polarization, and other normalization-independent features of the reaction, the model dependencies that affect the normalization uncertainty are not significantly improved. Assuming that the reaction model is most reliable at large Q 2 and modest p miss , the six 1p 1/2 -and 1p 3/2 -state normalization factors for data set (d) in Table X (this work) were averaged to conclude that the normalization factors for the lowest 1p 1/2 -and 1p 3/2 -states in 15 N are approximately 0.63(9) and 0.60 (9).…”

Section: Kinematic Consistency Of 1p-shell Normalization Factorsmentioning

confidence: 99%

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Dynamics of the quasielasticO16(e,e′p)reaction at
Fissum¹,
Liang²,
Anderson³
et al. 2004
Phys. Rev. C

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The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the 16 O(e, e ′ p) reaction in quasielastic, constant (q, ω) kinematics at Q 2 ≈ 0.8 (GeV/c) 2 , q ≈ 1 GeV/c, and ω ≈ 445 MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0 < pmiss < 350 MeV/c. Six-fold differential cross-section data for 0 < Emiss < 120 MeV were obtained for 0 < pmiss < 340 MeV/c. These results have been used to extract the ALT asymmetry and the RL, RT , RLT , and RL+T T effective response functions over a large range of Emiss and pmiss. Detailed comparisons of the 1p-shell data with Relativistic Distorted-Wave Impulse Approximation (rdwia), Relativistic Optical-Model Eikonal Approximation (romea), and Relativistic Multiple-Scattering Glauber Approximation (rmsga) calculations indicate that two-body currents stemming from Meson-Exchange Currents (MEC) and Isobar Currents (IC) are not needed to explain the data at this Q 2 . Further, dynamical relativistic effects are strongly indicated by the observed structure in ALT at pmiss ≈ 300 MeV/c. For 25 < Emiss < 50 MeV and pmiss ≈ 50 MeV/c, proton knockout from the 1s 1/2 -state dominates, and romea calculations do an excellent job of explaining the data. However, as pmiss increases, the single-particle behavior of the reaction is increasingly hidden by more complicated processes, and for 280 < pmiss < 340 MeV/c, romea calculations together with two-body currents stemming from MEC and IC account for the shape and transverse nature of the data, but only about half the magnitude of the measured cross section. For 50 < Emiss < 120 MeV and 145 < pmiss < 340 MeV/c, (e, e ′ pN ) calculations which include the contributions of central and tensor correlations (two-nucleon correlations) together with MEC and IC (two-nucleon currents) account for only about half of the measured cross section. The kinematic consistency of the 1p-shell normalization factors extracted from these data with respect to all available 16 O(e, e ′ p) data is also examined in detail. Finally, the Q 2 -dependence of the normalization factors is discussed.

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High-momentum components in the 1p orbitals of 16O

Cited by 35 publications

References 12 publications

Spectral function at high missing energies and momenta

Spectral function at high missing energies and momenta

Correlated Strength in the Nuclear Spectral Function

Dynamics of the quasielasticO16(e,e′p)reaction at
Fissum¹,
Liang²,
Anderson³
et al. 2004
Phys. Rev. C

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High-momentum components in the 1p orbitals of 16O

Cited by 35 publications

References 12 publications

Spectral function at high missing energies and momenta

Spectral function at high missing energies and momenta

Correlated Strength in the Nuclear Spectral Function

Dynamics of the quasielasticO16(e,e′p)reaction atFissum1, Liang2, Anderson3 et al. 2004Phys. Rev. C

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Dynamics of the quasielasticO16(e,e′p)reaction at
Fissum¹,
Liang²,
Anderson³
et al. 2004
Phys. Rev. C